FAW J6P Sub-Box Spindle: Deconstructing 14 Critical Parts for Flawless Range Output

Welcome to this expert analysis of the FAW J6P Sub-Box Spindle, or auxiliary box mainshaft, for the CA10TA160M 10-speed transmission. This component is a cornerstone of the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck’s drivetrain. This guide deconstructs the 14 critical parts that make up the complete FAW J6P Sub-Box Spindle assembly.

The FAW J6P Sub-Box Spindle is the final output shaft of the entire gearbox. Its logic is to receive power from the main box (via the Sub-Box Drive Gear) and then, using its integrated Hi/Lo synchronizer, transmit that power *either* through its “Low” gear set or in “High” (direct drive) to the output flange and driveshaft.

Core 1: The “Spindle & Output Flange” Logic (The Core Shaft)

This group represents the “spine” and the final “output” of the entire gearbox. It is the FAW J6P Sub-Box Spindle itself, and the flange that connects it to the rest of the truck.

1. Component: ‘Output shaft – auxiliary box’ (1701541-A7G)
This (Comp 5) is the ‘Output shaft – auxiliary box’, the component we refer to as the FAW J6P Sub-Box Spindle. This is a massive, single-piece shaft, precision-machined with multiple splines, steps, and bearing surfaces.

The Dual-Path Logic is its function. Its front “tip” receives power from the main box. Its main body is splined to hold the “Hi/Lo” synchronizer assembly (Comp 2, 3, 4). Its rear section is splined to hold the ‘Output flange’ (Comp 13). This one shaft manages two different power paths (Hi and Lo).

2. The “Output Flange” Group (Comp 13, 14, 12)
This group includes: ‘Output flange’ (Comp 13), ‘Lock nut assy’ (Comp 14), and ‘Dust cover – output flange’ (Comp 12). This is the final connection point of the FAW J6P Sub-Box Spindle.

The Connection Logic is the job of the ‘Output flange’ (Comp 13). This is a heavy-duty yoke flange. Its internal splines slide onto the external splines at the very rear of the FAW J6P Sub-Box Spindle (Comp 5). This flange is what the truck’s main driveshaft bolts to.

The Retention Logic is the job of the ‘Lock nut assy’ (Comp 14). This is a massive, high-torque nut that threads onto the end of the FAW J6P Sub-Box Spindle. It physically “pulls” the flange (Comp 13) and the main bearing (Comp 9) together, setting the bearing pre-load and ensuring the flange can never slide off.

The Sealing Logic is the job of the ‘Dust cover’ (Comp 12). This is a stamped metal shield, often pressed onto the flange, that works with the main output seal to protect the seal from road debris, water, and dirt, ensuring a long, leak-free life for the FAW J6P Sub-Box Spindle.

Core 2: The “Hi/Lo Range Synchronizer” Logic (The Shifter)

This is the “shifter” of the auxiliary box. This entire assembly slides on the FAW J6P Sub-Box Spindle to select either the High (direct drive) or Low (gear reduction) range.

1. The “Synchronizer Hub” Group (Comp 2, 4)
This group includes: ‘High gear synchronizer cone assy’ (Comp 2) and ‘Low gear synchronizer cone assy’ (Comp 4). These are the “hubs” of the synchronizer.

The Friction Logic is their function. These “cone” assemblies are the friction surfaces. When the driver selects “Hi” range, the ‘Sliding gear sleeve’ (Comp 3) pushes against the ‘High gear cone’ (Comp 2). This cone’s friction surface rubs against the ‘Sub-Box Drive Gear’ (from the previous breakdown), matching its speed to the speed of the FAW J6P Sub-Box Spindle. This synchronization prevents gear “grind” during a range shift.

The same action happens in reverse: when selecting “Lo,” the sleeve (Comp 3) pushes the ‘Low gear cone’ (Comp 4) against the ‘Low gear’ (Comp 7) to match its speed to the FAW J6P Sub-Box Spindle.

2. Component: ‘Sliding gear sleeve – auxiliary box synchronizer’ (1701561-A7G)
This (Comp 3) is the ‘Sliding gear sleeve’. This is the “shifter” itself. It has internal splines that lock it to the FAW J6P Sub-Box Spindle. An external groove is where the air-powered shift fork sits.

The Locking Logic is its function. When the driver selects “Hi,” this sleeve slides forward, engaging its internal “dog teeth” with the external dog teeth on the ‘Sub-Box Drive Gear’. This creates a 1:1 “direct drive,” locking the input to the output.

When the driver selects “Lo,” this sleeve slides *backward*, disengaging from the drive gear and engaging its teeth with the ‘Low gear’ (Comp 7), locking *it* to the FAW J6P Sub-Box Spindle. This routes power through the reduction gear set.

3. Component: ‘Spring – auxiliary box synchronizer’ (1701551-A7G) – Qty 3
These (Comp 1) are the “detent” springs. These three springs sit in the synchronizer hubs (Comp 2/4) and push on small “keys” (or “struts”). Their logic is to provide the “detent” or “snap” that holds the ‘Sliding gear sleeve’ (Comp 3) in its Neutral position, preventing it from accidentally engaging.

Core 3: The “Low Range Gear” Logic (The Reduction Gear)

This group contains the actual “gear” for the Low range, which is driven by the countershafts and, when selected, drives the FAW J6P Sub-Box Spindle.

1. Component: ‘Low gear – output shaft’ (1701542-A7G)
This (Comp 7) is the ‘Low gear’. This is a large, wide, heavy-duty gear that is in *constant mesh* with the drive gears on the auxiliary countershafts (like the ‘Sub-Box Left Upper Centre Shaft’).

The Freewheeling Logic is critical. This gear (Comp 7) sits on a large bearing (Comp 9) and *freely spins* on the FAW J6P Sub-Box Spindle (Comp 5). It is always being spun by the countershafts, but it does not transmit any power *until* the ‘Sliding gear sleeve’ (Comp 3) slides backward and locks onto its dog teeth.

2. The “Positioning” Group (Comp 6, 8)
This group includes: ‘Limiting washer – low gear’ (Comp 6) and ‘Positioning washer – low gear’ (Comp 8).

The Thrust Logic is their function. These two hardened steel washers act as “thrust washers.” They are placed on the front and back faces of the ‘Low gear’ (Comp 7). They create a “sandwich” that controls the gear’s “axial end play” (fore-and-aft movement) on the FAW J6P Sub-Box Spindle. This ensures the gear stays perfectly aligned with the countershaft gears and the synchronizer sleeve.

Core 4: The “Bearing & Speedometer” Logic

This final group includes the main support bearing for the FAW J6P Sub-Box Spindle and the components that drive the speedometer.

1. Component: ‘Double-row tapered roller bearing’ (350614X4DR-1)
This (Comp 9) is the main bearing for the *rear* of the FAW J6P Sub-Box Spindle. This is an extremely heavy-duty, “double-row” tapered roller bearing.

The Support Logic is absolute. This one bearing, pressed onto the FAW J6P Sub-Box Spindle (Comp 5) and into the rear of the gearbox housing, is designed to handle *all* radial loads (from the driveshaft) and *all* axial thrust loads (from the helical gears) in *both directions*. It is the main “anchor” for the entire output shaft.

2. The “Speedometer” Group (Comp 11, 10)
This group includes: ‘Driven gear – for speedometer drive’ (Comp 11) and ‘Counting tooth washer’ (Comp 10).

The Speed Sensor Logic is their function. The ‘Driven gear’ (Comp 11) is a small plastic gear (often called a “speedo gear”) that is pressed onto the FAW J6P Sub-Box Spindle (Comp 5). As the spindle rotates, this gear spins.

This gear (Comp 11) then meshes with a “drive gear” on the electronic speed sensor, which sends the road speed signal to the dashboard. The ‘Counting tooth washer’ (Comp 10) may be a “tone ring” for an ABS or electronic sensor, or it may be a simple spacer, depending on the truck’s specific model. It is an integral part of the FAW J6P Sub-Box Spindle‘s data-output system.

FAW J6P Sub-Box Spindle: Complete 14-Part Breakdown

The following table provides the complete, detailed breakdown of all 14 component types in the FAW J6P Sub-Box Spindle assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck.

Core Specifications

The specifications for the FAW J6P Sub-Box Spindle are defined by its role as the final, load-bearing output shaft of the entire transmission, which also houses the Hi/Lo range synchronizer.